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From: Vinod Koul <vkoul@kernel.org>
To: Rob Clark <robdclark@gmail.com>
Cc: linux-arm-msm@vger.kernel.org,
	Bjorn Andersson <bjorn.andersson@linaro.org>,
	Vinod Koul <vkoul@kernel.org>, David Airlie <airlied@linux.ie>,
	Daniel Vetter <daniel@ffwll.ch>,
	Jonathan Marek <jonathan@marek.ca>,
	Dmitry Baryshkov <dmitry.baryshkov@linaro.org>,
	Abhinav Kumar <abhinavk@codeaurora.org>,
	Jeffrey Hugo <jeffrey.l.hugo@gmail.com>,
	Sumit Semwal <sumit.semwal@linaro.org>,
	linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org,
	freedreno@lists.freedesktop.org
Subject: [PATCH 09/11] drm/msm/disp/dpu1: Add support for DSC in topology
Date: Thu, 15 Jul 2021 12:22:01 +0530	[thread overview]
Message-ID: <20210715065203.709914-10-vkoul@kernel.org> (raw)
In-Reply-To: <20210715065203.709914-1-vkoul@kernel.org>

For DSC to work we typically need a 2,2,1 configuration. This should
suffice for resolutions upto 4k. For more resolutions like 8k this won't
work.

The topology information is provided by DTS so we try to deduce the
topology required for DSC.
Furthermore, we can use 1 DSC encoder in lesser resolutions, but that is
not power efficient according to Abhinav, it is better to use 2 mixers
as that will split width/2 and is proven to be power efficient.

Also, the panel has been tested only with 2,2,1 configuration, so for
now we blindly create 2,2,1 topology when DSC is enabled

Co-developed-by: Abhinav Kumar <abhinavk@codeaurora.org>
Signed-off-by: Abhinav Kumar <abhinavk@codeaurora.org>
Signed-off-by: Vinod Koul <vkoul@kernel.org>
---
Changes since RFC:
 - Add more details in changelog

 drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
index 41140b781e66..8f0a8bd9c8ff 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
@@ -573,6 +573,8 @@ static struct msm_display_topology dpu_encoder_get_topology(
 			struct drm_display_mode *mode)
 {
 	struct msm_display_topology topology = {0};
+	struct drm_encoder *drm_enc;
+	struct msm_drm_private *priv;
 	int i, intf_count = 0;
 
 	for (i = 0; i < MAX_PHYS_ENCODERS_PER_VIRTUAL; i++)
@@ -607,8 +609,22 @@ static struct msm_display_topology dpu_encoder_get_topology(
 	topology.num_enc = 0;
 	topology.num_intf = intf_count;
 
+	drm_enc = &dpu_enc->base;
+	priv = drm_enc->dev->dev_private;
+	if (priv && priv->dsc) {
+		/* In case of Display Stream Compression DSC, we would use
+		 * 2 encoders, 2 line mixers and 1 interface
+		 * this is power optimal and can drive upto (including) 4k
+		 * screens
+		 */
+		topology.num_enc = 2;
+		topology.num_intf = 1;
+		topology.num_lm = 2;
+	}
+
 	return topology;
 }
+
 static int dpu_encoder_virt_atomic_check(
 		struct drm_encoder *drm_enc,
 		struct drm_crtc_state *crtc_state,
-- 
2.31.1


  parent reply	other threads:[~2021-07-15  6:53 UTC|newest]

Thread overview: 41+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-15  6:51 [PATCH 00/11] drm/msm: Add Display Stream Compression Support Vinod Koul
2021-07-15  6:51 ` [PATCH 01/11] drm/msm/dsi: add support for dsc data Vinod Koul
2021-08-02 22:55   ` [Freedreno] " abhinavk
2021-10-06  5:24     ` Vinod Koul
2021-07-15  6:51 ` [PATCH 02/11] drm/msm/disp/dpu1: Add support for DSC Vinod Koul
2021-07-19  8:28   ` kernel test robot
2021-08-02 23:03   ` [Freedreno] " abhinavk
2021-10-06  5:36     ` Vinod Koul
2021-07-15  6:51 ` [PATCH 03/11] drm/msm/disp/dpu1: Add support for DSC in pingpong block Vinod Koul
2021-08-02 23:07   ` [Freedreno] " abhinavk
2021-07-15  6:51 ` [PATCH 04/11] drm/msm/disp/dpu1: Add DSC support in RM Vinod Koul
2021-07-29 20:23   ` Dmitry Baryshkov
2021-10-06 10:26     ` Vinod Koul
2021-08-02 23:24   ` [Freedreno] " abhinavk
2021-10-06 10:27     ` Vinod Koul
2021-07-15  6:51 ` [PATCH 05/11] drm/msm/disp/dpu1: Add DSC for SDM845 to hw_catalog Vinod Koul
2021-07-29 20:25   ` Dmitry Baryshkov
2021-10-06 10:50     ` Vinod Koul
2021-08-02 23:29   ` [Freedreno] " abhinavk
2021-10-06 10:52     ` Vinod Koul
2021-07-15  6:51 ` [PATCH 06/11] drm/msm/disp/dpu1: Add DSC support in hw_ctl Vinod Koul
2021-07-29 22:15   ` Dmitry Baryshkov
2021-10-06 12:21     ` Vinod Koul
2021-08-03  0:00   ` [Freedreno] " abhinavk
2021-10-06 12:21     ` Vinod Koul
2021-07-15  6:51 ` [PATCH 07/11] drm/msm/disp/dpu1: Don't use DSC with mode_3d Vinod Koul
2021-08-03  0:24   ` [Freedreno] " abhinavk
2021-10-06 12:22     ` Vinod Koul
2021-07-15  6:52 ` [PATCH 08/11] drm/msm/disp/dpu1: Add support for DSC in encoder Vinod Koul
2021-07-19  8:54   ` kernel test robot
2021-07-29 20:54   ` Dmitry Baryshkov
2021-10-06 12:43     ` Vinod Koul
2021-08-03  0:57   ` [Freedreno] " abhinavk
2021-10-06 12:47     ` Vinod Koul
2021-07-15  6:52 ` Vinod Koul [this message]
2021-08-03  1:05   ` [Freedreno] [PATCH 09/11] drm/msm/disp/dpu1: Add support for DSC in topology abhinavk
2021-07-15  6:52 ` [PATCH 10/11] drm/msm/dsi: Add support for DSC configuration Vinod Koul
2021-07-29 22:10   ` Dmitry Baryshkov
2021-08-03  1:16   ` [Freedreno] " abhinavk
2021-07-15  6:52 ` [PATCH 11/11] drm/msm/dsi: Pass DSC params to drm_panel Vinod Koul
2021-08-03  1:22   ` [Freedreno] " abhinavk

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